AP Biology Unit 4 Review

Front

What are plasmodesmata?

Back

Plasmodesmata are junctions in the cell wall of plant cells that allow for the direct exchange of small soluble compounds between neighboring cells.

Front

What is the effect of a mutation in a receptor protein?

Back

A mutation in a receptor protein can lead to altered signal transduction, affecting how signals are processed within the cell.

Front

What is the primary role of checkpoints in the cell cycle?

Back

Checkpoints in the cell cycle regulate progression through the cell cycle, ensuring that cells only proceed to the next phase when conditions are favorable.

Front

What is the function of second messengers in cell signaling?

Back

Second messengers amplify the signal received by the receptor, facilitating a stronger and more widespread cellular response.

Front

Define a catabolic reaction.

Back

A catabolic reaction is a metabolic process that breaks down complex molecules into simpler components, releasing energy in the process.

Front

What are gap junctions?

Back

Gap junctions are specialized intercellular connections that allow for the direct transfer of ions and small molecules between adjacent cells.

Front

What is the role of thylakoids in plant cells?

Back

Thylakoids are membrane-bound structures within chloroplasts where the light-dependent reactions of photosynthesis occur.

Front

What is apoptosis?

Back

Apoptosis is a programmed cell death process that eliminates damaged or unnecessary cells in a controlled manner.

Front

What is signal transduction?

Back

Signal transduction is the process by which a cell responds to external signals through a series of molecular events, leading to a cellular response.

Front

What is the difference between anabolic and catabolic reactions?

Back

Anabolic reactions build complex molecules from simpler ones and require energy, while catabolic reactions break down complex molecules and release energy.